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Tuner power supply control circuit and system, and digital set-top box

A technology of power supply control circuit and high-frequency head, which is applied in the parts, televisions, electrical components and other directions of TV systems, and can solve problems such as voltage drop.

Active Publication Date: 2017-09-22
HISENSE VISUAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] This application provides a high-frequency head power supply control circuit, system and digital set-top box to solve the problem of voltage drop of other power supply modules of the power management chip caused by the short circuit of the LNB

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  • Tuner power supply control circuit and system, and digital set-top box
  • Tuner power supply control circuit and system, and digital set-top box
  • Tuner power supply control circuit and system, and digital set-top box

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Embodiment Construction

[0019] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with aspects of the invention as recited in the appended claims.

[0020] Aiming at the problem of voltage drop caused by LNB short circuit in the prior art, this application provides a power supply control circuit for LNB, which can provide effective short circuit protection for the LNB power supply circuit. The core principle is: through the switch control unit 20 pair The power supply output terminal of the tuner power supply control circuit is detected, and...

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PUM

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Abstract

The invention provides a tuner power supply control circuit and system, and a digital set-top box. The circuit comprises a voltage conversion unit, a switch control unit and a power switch unit, when an output voltage is a load working voltage, the switch control unit outputs a first control signal, and when the output voltage is a load short circuit voltage, the switch control unit outputs a second control signal; and the power switch unit is turned off when receiving the second control signal and is turned on when receiving the first control signal, and outputs a tuner supply voltage. According to the tuner power supply control circuit provided by the invention, whether the tuner has a short circuit phenomenon by detecting the output voltage of a power supply output end through the switch control unit, in the case of short circuit of the tuner, the power supply input end of the tuner power supply control circuit is not affected by the voltage drop of the power supply output end, thereby ensuring the stable state of the supply voltages of other power supply modules in a power supply management chip.

Description

technical field [0001] The present application relates to the field of tuner power supply, in particular to a tuner power supply control circuit, system and digital set-top box. Background technique [0002] As the core equipment of the digital satellite TV system, the digital set-top box has entered thousands of households. The digital satellite set-top box is mainly composed of multiple parts such as amplifier, frequency converter, demodulator, decoder, CPU, expansion interface and power supply. Among them, the LNB (Low Noise Down Converter or LNB, English full name: Low Noise Block) composed of an amplifier and a frequency converter is a key component of a digital set-top box, which can down-frequency, filter noise and amplify high-frequency satellite signals. processing to ensure that the TV receives a clear video signal. [0003] Usually, the TV terminal directly provides the voltage required for normal operation to the LNB through the LNB power supply circuit, and th...

Claims

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Application Information

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IPC IPC(8): H04N5/63H04N21/442H04N21/443
CPCH04N5/63H04N21/4424H04N21/4436
Inventor 董泽鑫
Owner HISENSE VISUAL TECH CO LTD